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Updated: Jun 12, 2026
10:05
A Large Lateral Craniotomy Procedure for Mesoscale Wide-field Optical Imaging of Brain Activity
Published on: May 7, 2017
Cortex-specific inversion of visual responses during sleep
Nicholas G Cicero1,2,3, Michaela Klimova4,5, Louis Vinke6
1Graduate Program for Neuroscience, Boston University, Boston, USA.
Nature Communications
|June 10, 2026
Summary
Even during early sleep stages, the brain processes light. Visual thalamus responses remain intact, but visual cortex responses are suppressed, suggesting inhibitory circuits aid sensory isolation.
Area of Science:
- Neuroscience
- Sleep Science
- Visual Processing
Background:
- Sleep involves functional disengagement from the environment, reducing sensory input.
- Light can still reach the brain through closed eyelids, and luminance changes are perceived.
- Sensory information gating by the thalamus during sleep is debated, as some input reaches the cortex.
Purpose of the Study:
- To investigate how visual inputs are modulated during sleep.
- To understand thalamic and cortical processing of visual information during sleep.
- To elucidate the mechanisms of sensory isolation during early sleep stages.
Main Methods:
- Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) were used.
- Luminance-modulated visual stimuli were presented to sleeping human participants.
- Brain activity in response to visual stimuli was recorded during N1 and N2 sleep stages.
Main Results:
- Visual thalamus responses to light remained intact during N1 and N2 sleep.
- Early visual cortex responses to stimuli were significantly suppressed.
- High-intensity stimulation paradoxically caused visual cortical deactivation, not activation.
Conclusions:
- A cortical mechanism involving inhibitory circuits regulates visual cortex responses during sleep.
- This inhibitory regulation leads to stimulus-driven deactivation in the visual cortex.
- These findings suggest a mechanism facilitating sensory isolation in early sleep stages.
- Meta_Description_Content
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